2 * This file is part of DisOrder.
3 * Copyright (C) 2004, 2007, 2008 Richard Kettlewell
5 * This program is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program. If not, see <http://www.gnu.org/licenses/>.
19 * @brief Socket address support */
23 #include <sys/types.h>
24 #include <sys/socket.h>
25 #include <netinet/in.h>
26 #include <arpa/inet.h>
34 #include "configuration.h"
37 /** @brief Convert a pair of strings to an address
38 * @param a Pointer to string list
39 * @param pref Hints structure for getaddrinfo, or NULL
40 * @param namep Where to store address description, or NULL
41 * @return Address info structure or NULL on error
43 * This converts one or two strings into an address specification suitable
44 * for passing to socket(), bind() etc.
46 * If there is only one string then it is assumed to be the service
47 * name (port number). If there are two then the first is the host
48 * name and the second the service name.
50 * @p namep is used to return a description of the address suitable
51 * for use in log messages.
53 * If an error occurs a message is logged and a null pointer returned.
55 struct addrinfo *get_address(const struct stringlist *a,
56 const struct addrinfo *pref,
64 byte_xasprintf(&name, "host * service %s", a->s[0]);
65 if((rc = getaddrinfo(0, a->s[0], pref, &res))) {
66 error(0, "getaddrinfo %s: %s", a->s[0], gai_strerror(rc));
71 byte_xasprintf(&name, "host %s service %s", a->s[0], a->s[1]);
72 if((rc = getaddrinfo(a->s[0], a->s[1], pref, &res))) {
73 error(0, "getaddrinfo %s %s: %s", a->s[0], a->s[1], gai_strerror(rc));
78 error(0, "invalid network address specification (n=%d)", a->n);
81 if(!res || (pref && res->ai_socktype != pref->ai_socktype)) {
82 error(0, "getaddrinfo didn't give us a suitable socket address");
92 /** @brief Comparison function for address information
94 * Suitable for qsort().
96 int addrinfocmp(const struct addrinfo *a,
97 const struct addrinfo *b) {
98 const struct sockaddr_in *ina, *inb;
99 const struct sockaddr_in6 *in6a, *in6b;
101 if(a->ai_family != b->ai_family) return a->ai_family - b->ai_family;
102 if(a->ai_socktype != b->ai_socktype) return a->ai_socktype - b->ai_socktype;
103 if(a->ai_protocol != b->ai_protocol) return a->ai_protocol - b->ai_protocol;
104 switch(a->ai_family) {
106 ina = (const struct sockaddr_in *)a->ai_addr;
107 inb = (const struct sockaddr_in *)b->ai_addr;
108 if(ina->sin_port != inb->sin_port) return ina->sin_port - inb->sin_port;
109 return ina->sin_addr.s_addr - inb->sin_addr.s_addr;
112 in6a = (const struct sockaddr_in6 *)a->ai_addr;
113 in6b = (const struct sockaddr_in6 *)b->ai_addr;
114 if(in6a->sin6_port != in6b->sin6_port)
115 return in6a->sin6_port - in6b->sin6_port;
116 return memcmp(&in6a->sin6_addr, &in6b->sin6_addr,
117 sizeof (struct in6_addr));
119 error(0, "unsupported protocol family %d", a->ai_protocol);
120 return memcmp(a->ai_addr, b->ai_addr, a->ai_addrlen); /* kludge */
124 /** @brief Return nonzero if @p sin4 is an IPv4 multicast address */
125 static inline int multicast4(const struct sockaddr_in *sin4) {
126 return IN_MULTICAST(ntohl(sin4->sin_addr.s_addr));
129 /** @brief Return nonzero if @p sin6 is an IPv6 multicast address */
130 static inline int multicast6(const struct sockaddr_in6 *sin6) {
131 return IN6_IS_ADDR_MULTICAST(&sin6->sin6_addr);
134 /** @brief Return true if @p sa represents a multicast address */
135 int multicast(const struct sockaddr *sa) {
136 switch(sa->sa_family) {
138 return multicast4((const struct sockaddr_in *)sa);
140 return multicast6((const struct sockaddr_in6 *)sa);
146 /** @brief Format an IPv4 address */
147 static inline char *format_sockaddr4(const struct sockaddr_in *sin4) {
148 char buffer[1024], *r;
151 byte_xasprintf(&r, "%s port %u",
152 inet_ntop(sin4->sin_family, &sin4->sin_addr,
153 buffer, sizeof buffer),
154 ntohs(sin4->sin_port));
156 byte_xasprintf(&r, "%s",
157 inet_ntop(sin4->sin_family, &sin4->sin_addr,
158 buffer, sizeof buffer));
162 /** @brief Format an IPv6 address */
163 static inline char *format_sockaddr6(const struct sockaddr_in6 *sin6) {
164 char buffer[1024], *r;
167 byte_xasprintf(&r, "%s port %u",
168 inet_ntop(sin6->sin6_family, &sin6->sin6_addr,
169 buffer, sizeof buffer),
170 ntohs(sin6->sin6_port));
172 byte_xasprintf(&r, "%s",
173 inet_ntop(sin6->sin6_family, &sin6->sin6_addr,
174 buffer, sizeof buffer));
178 /** @brief Format a UNIX socket address */
179 static inline char *format_sockaddrun(const struct sockaddr_un *sun) {
180 return xstrdup(sun->sun_path);
183 /** @brief Construct a text description a sockaddr
184 * @param sa Socket address
185 * @return Human-readable form of address
187 char *format_sockaddr(const struct sockaddr *sa) {
188 switch(sa->sa_family) {
190 return format_sockaddr4((const struct sockaddr_in *)sa);
192 return format_sockaddr6((const struct sockaddr_in6 *)sa);
194 return format_sockaddrun((const struct sockaddr_un *)sa);
200 /** @brief Parse the text form of a network address
201 * @param na Where to store result
202 * @param nvec Number of strings
203 * @param vec List of strings
204 * @return 0 on success, -1 on syntax error
206 int netaddress_parse(struct netaddress *na,
212 if(nvec > 0 && vec[0][0] == '-') {
213 if(!strcmp(vec[0], "-4"))
215 else if(!strcmp(vec[0], "-6"))
217 else if(!strcmp(vec[0], "-unix"))
219 else if(!strcmp(vec[0], "-"))
228 /* Possibilities are:
230 * /path/to/unix/socket an AF_UNIX socket
231 * * PORT any address, specific port
232 * PORT any address, specific port
233 * ADDRESS PORT specific address, specific port
235 if(vec[0][0] == '/' && na->af == AF_UNSPEC)
237 if(na->af == AF_UNIX) {
240 na->address = xstrdup(vec[0]);
241 na->port = -1; /* makes no sense */
249 if(!strcmp(vec[0], "*"))
252 na->address = xstrdup(vec[0]);
258 if(port[strspn(port, "0123456789")])
261 int e = xstrtol(&p, port, NULL, 10);
272 /** @brief Format a @ref netaddress structure
273 * @param na Network address to format
274 * @param nvecp Where to put string count, or NULL
275 * @param vecp Where to put strings
277 * The formatted form is suitable for passing to netaddress_parse().
279 void netaddress_format(const struct netaddress *na,
286 case AF_UNSPEC: vector_append(v, xstrdup("-")); break;
287 case AF_INET: vector_append(v, xstrdup("-4")); break;
288 case AF_INET6: vector_append(v, xstrdup("-6")); break;
289 case AF_UNIX: vector_append(v, xstrdup("-unix")); break;
292 vector_append(v, xstrdup(na->address));
294 vector_append(v, xstrdup("*"));
298 snprintf(buffer, sizeof buffer, "%d", na->port);
299 vector_append(v, xstrdup(buffer));
308 /** @brief Resolve a network address
309 * @param na Address structure
310 * @param passive True if passive (bindable) address is desired
311 * @param protocol Protocol number desired (e.g. @c IPPROTO_TCP)
312 * @return List of suitable addresses or NULL
314 struct addrinfo *netaddress_resolve(const struct netaddress *na,
317 struct addrinfo *res, hints[1];
321 memset(hints, 0, sizeof hints);
322 hints->ai_family = na->af;
323 hints->ai_protocol = protocol;
324 hints->ai_flags = passive ? AI_PASSIVE : 0;
325 snprintf(service, sizeof service, "%d", na->port);
326 rc = getaddrinfo(na->address, service, hints, &res);
328 error(0, "getaddrinfo %s %d: %s",
329 na->address ? na->address : "*",
330 na->port, gai_strerror(rc));